Write a Java application that implements a basic Text Analyzer. The Java application will analyze text stored in a text file. The user should be able to select a file to analyze and the application should produce the following text metrics:

Number of characters in the text.

Relative frequency of letters in the text in descending order. (How the relative frequency that you calculated compares with relative letter frequencies in English already published?)

Number of words in the text.

The sizes of the longest and the shortest word.

The twenty most repeated uni-grams (single words) in the text in descending order.

The twenty most repeated bi-grams (pairs of words) in the text in descending order.